Cách sử dụng
A tunnel is a special kind of road or passage that goes through something, usually underground or through a mountain. It's like a tube that you can drive a car, ride a train or walk through. People use tunnels to help them get through places that would be difficult or dangerous to go over or around, like a river or a mountain. Tunnels are also used for transportation systems like subways and underground trains. So if you hear the word tunnel, it means that there is a way to go through a place without going over it or around it.